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Zn-Al共掺对0.95MgTiO3-0.05CaTiO3介电性能的影响

杨秀玲, 丁士华, 宋天秀, 张 东   

  1. 西华大学 材料科学与工程学院, 成都 610039
  • 收稿日期:2008-06-22 修回日期:2008-07-23 出版日期:2009-03-20 网络出版日期:2009-03-20

Influence of Zn-Al Codoping on Dielectric Properties of 0.95MgTiO3-0.05CaTiO3 Ceramics

YANG Xiu-Ling, DING Shi-Hua, SONG Tian-Xiu, ZHANG Dong   

  1. College of Materials Science & Engineering, Xihua University, Chengdu 610039, China
  • Received:2008-06-22 Revised:2008-07-23 Published:2009-03-20 Online:2009-03-20

摘要: 采用固相反应法制备了 (Mg0.93Ca0.05Zn0.02)(Ti1-xAlx)O3介质陶瓷.研究了Zn-Al共掺杂对0.95MgTiO3-0.05CaTiO3(95MCT)陶瓷介电性能的影响.结果表明:Zn-Al共掺杂的95MCT陶瓷的主晶相为MgTiO3和CaTiO3两相结构,Zn-Al共掺杂可以抑制中间相MgTi2O5的产生,同时,有第二相CaAl2O4出现;Zn-Al共掺杂能有效地降低95MCT陶瓷的烧结温度至1300℃,改善介电性能,并对介电常数温度系数具有调节作用.当 Zn2+掺杂量为0.02mol、Al3+掺杂量为0.02mol时, 在1300℃烧结2.5h获得最佳性能:εr =20.35, tgδ=2.0×106, αc=1.78×106.

关键词: 0.95MgTiO3-0.05CaTiO3介质陶瓷, Zn-Al共掺杂, 介电性能

Abstract: The dielectric properties of (Mg0.95Ca0.05Zn0.02)(Ti1-xAlx)O3 ceramics prepared by conventional solid-state route were investigated. The results show that MgTiO3 and CaTiO3 are the main phases of 95MCT ceramics with codoped Zn-Al, without second phase MgTi2O5 is observed but a new phase CaAl2O4. Zn-Al additive can lower the sintering temperature of 95MCT ceramics to 1300℃, and improve the dielectric properties. Moreover, it also effectively adjusts the temperature coefficient of dielectric constant. The 95MCT ceramics with x=0.02 possess excellent dielectric properties: dielectric constant εr of 20.35, dielectric loss tgδ of 2.0×106 and temperature coefficient of dielectric constant αc value of 1.78×106.

Key words: 0.95MgTiO3-0.05CaTiO3 ceramics, Zn-Al codoped, dielectric properties

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